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Pokemon Red and Blue Seafoam Islands and Cinnabar Route Walkthrough

Volcano Badge

Seafoam Islands and Cinnabar Route section for the Pokemon Red and Blue walkthrough with wild Pokemon, trainers, items, hidden items, coordinates, and boss strategy.

By Damodar Sharma Updated June 19, 2026 Walkthrough

Surf through the south sea route, solve Seafoam's boulder-current puzzle, and optionally catch Articuno. This page is a standalone section for Phase 7: Volcano Badge, with source-backed Red/Blue encounter, trainer, item, hidden item, and boss data.

Source maps

Route 19, Route 20, Seafoam Islands 1F, Seafoam Islands B1F, Seafoam Islands B2F, Seafoam Islands B3F, Seafoam Islands B4F, and Cinnabar Island.

Wild rows94 Trainers20 Items3

Route plan

You can also Surf south from Pallet via Route 21, but Seafoam is core completion content and has Articuno.

Wild Pokemon

Version

Each area below has its own table, split by encounter method. Red/Blue has no time-of-day mechanic, so every method uses a single rate column, and the R/B chips show which version each row applies to. Tall grass, cave, and Surf rates merge every base slot for a species out of the Gen I ten-slot table: 51/256, 51/256, 39/256, 25/256, 25/256, 25/256, 13/256, 13/256, 11/256, and 3/256. Fishing, gift, trade, prize, and static rows keep their own labeled rates.

Seafoam Islands 1F

Seafoam Islands 1F wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Tall grass / cave floor
Seel Red and Blue sprite Seel RB3020%—
Slowpoke Red and Blue sprite Slowpoke RB3020%—
Psyduck Red and Blue sprite Psyduck RB3020%—
Shellder Red and Blue sprite Shellder RB28-3020%—
Horsea Red and Blue sprite Horsea RB28-3020%—
Staryu Red and Blue sprite Staryu RB28-3020%—
Krabby Red and Blue sprite Krabby RB28-3020%—
Zubat Red and Blue sprite Zubat RB219.8%—
Golbat Red and Blue sprite Golbat RB295.1%—
Psyduck Red and Blue sprite Psyduck RB285.1%—
Slowpoke Red and Blue sprite Slowpoke RB285.1%—
Golduck Red and Blue sprite Golduck RB381.2%—
Slowbro Red and Blue sprite Slowbro RB381.2%—

Seafoam Islands B1F

Seafoam Islands B1F wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Tall grass / cave floor
Horsea Red and Blue sprite Horsea RB30-3230%—
Krabby Red and Blue sprite Krabby RB30-3230%—
Staryu Red and Blue sprite Staryu RB3020%—
Shellder Red and Blue sprite Shellder RB3020%—
Shellder Red and Blue sprite Shellder RB3215%—
Staryu Red and Blue sprite Staryu RB3215%—
Slowpoke Red and Blue sprite Slowpoke RB28-3015%—
Seel Red and Blue sprite Seel RB28-3015%—
Psyduck Red and Blue sprite Psyduck RB28-3015%—
Dewgong Red and Blue sprite Dewgong RB384.3%—
Seadra Red and Blue sprite Seadra RB371.2%—
Kingler Red and Blue sprite Kingler RB371.2%—

Seafoam Islands B2F

Seafoam Islands B2F wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Tall grass / cave floor
Seel Red and Blue sprite Seel RB30-3235%—
Slowpoke Red and Blue sprite Slowpoke RB30-3230%—
Psyduck Red and Blue sprite Psyduck RB30-3230%—
Horsea Red and Blue sprite Horsea RB28-3015%—
Krabby Red and Blue sprite Krabby RB28-3015%—
Staryu Red and Blue sprite Staryu RB309.8%—
Shellder Red and Blue sprite Shellder RB309.8%—
Shellder Red and Blue sprite Shellder RB285.1%—
Staryu Red and Blue sprite Staryu RB285.1%—
Golbat Red and Blue sprite Golbat RB304.3%—
Slowbro Red and Blue sprite Slowbro RB371.2%—
Golduck Red and Blue sprite Golduck RB371.2%—

Seafoam Islands B3F

Seafoam Islands B3F wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Tall grass / cave floor
Slowpoke Red and Blue sprite Slowpoke RB31-3335%—
Psyduck Red and Blue sprite Psyduck RB31-3335%—
Seel Red and Blue sprite Seel RB31-3330%—
Horsea Red and Blue sprite Horsea RB29-3115%—
Shellder Red and Blue sprite Shellder RB29-3115%—
Krabby Red and Blue sprite Krabby RB29-3115%—
Staryu Red and Blue sprite Staryu RB29-3115%—
Seadra Red and Blue sprite Seadra RB394.3%—
Kingler Red and Blue sprite Kingler RB394.3%—
Dewgong Red and Blue sprite Dewgong RB371.2%—
Fishing — Old Rod
Magikarp Red and Blue sprite Magikarp RB5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Red and Blue sprite Goldeen RB1050%Any fishable water tile after getting Good Rod.
Poliwag Red and Blue sprite Poliwag RB1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Staryu Red and Blue sprite Staryu RB1525%Super Rod group 8.
Horsea Red and Blue sprite Horsea RB1525%Super Rod group 8.
Shellder Red and Blue sprite Shellder RB1525%Super Rod group 8.
Goldeen Red and Blue sprite Goldeen RB1525%Super Rod group 8.

Seafoam Islands B4F

Seafoam Islands B4F wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Tall grass / cave floor
Horsea Red and Blue sprite Horsea RB31-3335%—
Krabby Red and Blue sprite Krabby RB31-3335%—
Shellder Red and Blue sprite Shellder RB31-3330%—
Staryu Red and Blue sprite Staryu RB31-3330%—
Slowpoke Red and Blue sprite Slowpoke RB29-3115%—
Seel Red and Blue sprite Seel RB29-3115%—
Psyduck Red and Blue sprite Psyduck RB29-3115%—
Slowbro Red and Blue sprite Slowbro RB394.3%—
Golduck Red and Blue sprite Golduck RB394.3%—
Golbat Red and Blue sprite Golbat RB321.2%—
Fishing — Old Rod
Magikarp Red and Blue sprite Magikarp RB5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Red and Blue sprite Goldeen RB1050%Any fishable water tile after getting Good Rod.
Poliwag Red and Blue sprite Poliwag RB1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Staryu Red and Blue sprite Staryu RB1525%Super Rod group 8.
Horsea Red and Blue sprite Horsea RB1525%Super Rod group 8.
Shellder Red and Blue sprite Shellder RB1525%Super Rod group 8.
Goldeen Red and Blue sprite Goldeen RB1525%Super Rod group 8.
Static Pokemon
Articuno Red and Blue sprite Articuno RB50StaticInteract with the overworld Pokemon.
Static legendary
Articuno Red and Blue sprite Articuno RB50StaticPush boulders to stop the current, then reach Articuno on B4F.

Route 19

Route 19 wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Fishing — Old Rod
Magikarp Red and Blue sprite Magikarp RB5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Red and Blue sprite Goldeen RB1050%Any fishable water tile after getting Good Rod.
Poliwag Red and Blue sprite Poliwag RB1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Staryu Red and Blue sprite Staryu RB1525%Super Rod group 8.
Horsea Red and Blue sprite Horsea RB1525%Super Rod group 8.
Shellder Red and Blue sprite Shellder RB1525%Super Rod group 8.
Goldeen Red and Blue sprite Goldeen RB1525%Super Rod group 8.

Route 20

Route 20 wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Fishing — Old Rod
Magikarp Red and Blue sprite Magikarp RB5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Red and Blue sprite Goldeen RB1050%Any fishable water tile after getting Good Rod.
Poliwag Red and Blue sprite Poliwag RB1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Staryu Red and Blue sprite Staryu RB1525%Super Rod group 8.
Horsea Red and Blue sprite Horsea RB1525%Super Rod group 8.
Shellder Red and Blue sprite Shellder RB1525%Super Rod group 8.
Goldeen Red and Blue sprite Goldeen RB1525%Super Rod group 8.

Cinnabar Island

Cinnabar Island wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Fishing — Old Rod
Magikarp Red and Blue sprite Magikarp RB5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Red and Blue sprite Goldeen RB1050%Any fishable water tile after getting Good Rod.
Poliwag Red and Blue sprite Poliwag RB1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Staryu Red and Blue sprite Staryu RB1525%Super Rod group 8.
Horsea Red and Blue sprite Horsea RB1525%Super Rod group 8.
Shellder Red and Blue sprite Shellder RB1525%Super Rod group 8.
Goldeen Red and Blue sprite Goldeen RB1525%Super Rod group 8.

Trainers

Route order Trainer Team Reward Optional / rematch note
1. Route 19 (8, 7)Swimmer trainer spriteSwimmerParty #2
Tentacool Red and Blue sprite Tentacool Lv. 30 Shellder Red and Blue sprite Shellder Lv. 30
$150One-time trainer; no rematch in Red/Blue.
2. Route 19 (13, 7)Swimmer trainer spriteSwimmerParty #3
Goldeen Red and Blue sprite Goldeen Lv. 29 Horsea Red and Blue sprite Horsea Lv. 29 Staryu Red and Blue sprite Staryu Lv. 29
$145One-time trainer; no rematch in Red/Blue.
3. Route 19 (13, 25)Swimmer trainer spriteSwimmerParty #4
Poliwag Red and Blue sprite Poliwag Lv. 30 Poliwhirl Red and Blue sprite Poliwhirl Lv. 30
$150One-time trainer; no rematch in Red/Blue.
4. Route 19 (4, 27)Swimmer trainer spriteSwimmerParty #5
Horsea Red and Blue sprite Horsea Lv. 27 Tentacool Red and Blue sprite Tentacool Lv. 27 Tentacool Red and Blue sprite Tentacool Lv. 27 Goldeen Red and Blue sprite Goldeen Lv. 27
$135One-time trainer; no rematch in Red/Blue.
5. Route 19 (16, 31)Swimmer trainer spriteSwimmerParty #6
Goldeen Red and Blue sprite Goldeen Lv. 29 Shellder Red and Blue sprite Shellder Lv. 29 Seaking Red and Blue sprite Seaking Lv. 29
$145One-time trainer; no rematch in Red/Blue.
6. Route 19 (9, 11)Swimmer trainer spriteSwimmerParty #7
Horsea Red and Blue sprite Horsea Lv. 30 Horsea Red and Blue sprite Horsea Lv. 30
$150One-time trainer; no rematch in Red/Blue.
7. Route 19 (8, 43)Beauty trainer spriteBeautyParty #12
Poliwag Red and Blue sprite Poliwag Lv. 27 Goldeen Red and Blue sprite Goldeen Lv. 27 Seaking Red and Blue sprite Seaking Lv. 27 Goldeen Red and Blue sprite Goldeen Lv. 27 Poliwag Red and Blue sprite Poliwag Lv. 27
$1,890One-time trainer; no rematch in Red/Blue.
8. Route 19 (11, 43)Beauty trainer spriteBeautyParty #13
Goldeen Red and Blue sprite Goldeen Lv. 30 Seaking Red and Blue sprite Seaking Lv. 30
$2,100One-time trainer; no rematch in Red/Blue.
9. Route 19 (9, 42)Swimmer trainer spriteSwimmerParty #8
Tentacool Red and Blue sprite Tentacool Lv. 27 Tentacool Red and Blue sprite Tentacool Lv. 27 Staryu Red and Blue sprite Staryu Lv. 27 Horsea Red and Blue sprite Horsea Lv. 27 Tentacruel Red and Blue sprite Tentacruel Lv. 27
$135One-time trainer; no rematch in Red/Blue.
10. Route 19 (10, 44)Beauty trainer spriteBeautyParty #14
Staryu Red and Blue sprite Staryu Lv. 29 Staryu Red and Blue sprite Staryu Lv. 29 Staryu Red and Blue sprite Staryu Lv. 29
$2,030One-time trainer; no rematch in Red/Blue.
11. Route 20 (87, 8)Swimmer trainer spriteSwimmerParty #9
Shellder Red and Blue sprite Shellder Lv. 31 Cloyster Red and Blue sprite Cloyster Lv. 31
$155One-time trainer; no rematch in Red/Blue.
12. Route 20 (68, 11)Beauty trainer spriteBeautyParty #15
Seadra Red and Blue sprite Seadra Lv. 30 Horsea Red and Blue sprite Horsea Lv. 30 Seadra Red and Blue sprite Seadra Lv. 30
$2,100One-time trainer; no rematch in Red/Blue.
13. Route 20 (45, 10)Beauty trainer spriteBeautyParty #6
Seaking Red and Blue sprite Seaking Lv. 35
$2,450One-time trainer; no rematch in Red/Blue.
14. Route 20 (55, 14)Jr. Trainer F trainer spriteJr. Trainer FParty #24
Tentacool Red and Blue sprite Tentacool Lv. 30 Horsea Red and Blue sprite Horsea Lv. 30 Seel Red and Blue sprite Seel Lv. 30
$600One-time trainer; no rematch in Red/Blue.
15. Route 20 (38, 13)Swimmer trainer spriteSwimmerParty #10
Staryu Red and Blue sprite Staryu Lv. 35
$175One-time trainer; no rematch in Red/Blue.
16. Route 20 (87, 13)Swimmer trainer spriteSwimmerParty #11
Horsea Red and Blue sprite Horsea Lv. 28 Horsea Red and Blue sprite Horsea Lv. 28 Seadra Red and Blue sprite Seadra Lv. 28 Horsea Red and Blue sprite Horsea Lv. 28
$140One-time trainer; no rematch in Red/Blue.
17. Route 20 (34, 9)Bird Keeper trainer spriteBird KeeperParty #11
Fearow Red and Blue sprite Fearow Lv. 30 Fearow Red and Blue sprite Fearow Lv. 30 Pidgeotto Red and Blue sprite Pidgeotto Lv. 30
$750One-time trainer; no rematch in Red/Blue.
18. Route 20 (25, 7)Beauty trainer spriteBeautyParty #7
Shellder Red and Blue sprite Shellder Lv. 30 Shellder Red and Blue sprite Shellder Lv. 30 Cloyster Red and Blue sprite Cloyster Lv. 30
$2,100One-time trainer; no rematch in Red/Blue.
19. Route 20 (24, 12)Jr. Trainer F trainer spriteJr. Trainer FParty #16
Goldeen Red and Blue sprite Goldeen Lv. 31 Seaking Red and Blue sprite Seaking Lv. 31
$620One-time trainer; no rematch in Red/Blue.
20. Route 20 (15, 8)Beauty trainer spriteBeautyParty #8
Poliwag Red and Blue sprite Poliwag Lv. 31 Seaking Red and Blue sprite Seaking Lv. 31
$2,170One-time trainer; no rematch in Red/Blue.

Items And Hidden Items

Item Type Area / direction Coordinate Requirement
NuggetHidden itemHidden on the searchable tile at (15, 15) in Seafoam Islands B2F.(15, 15)Press A on the hidden tile or use the Itemfinder nearby.
Max ElixerHidden itemHidden on the searchable tile at (9, 16) in Seafoam Islands B3F.(9, 16)Press A on the hidden tile or use the Itemfinder nearby.
Ultra BallHidden itemHidden on the searchable tile at (25, 17) in Seafoam Islands B4F.(25, 17)Press A on the hidden tile or use the Itemfinder nearby.

Boss Strategy

No boss or Rival branch is attached to this section.

Completion Checklist

  • Push boulders to control currents.
  • Catch Articuno if desired.
  • Reach Cinnabar Island.
  • Verify the wild table's version splits before leaving if you are filling the Pokedex.
  • Use the item rows as a visible-item and hidden-item sweep before moving to the next section.

Sources

  • pret/pokered: wild encounters, trainer parties, trainer money, map object events, hidden event items, rods, trades, and prize Pokemon.
  • Encounter odds aggregate the Gen I ten-slot rates: 51/256, 51/256, 39/256, 25/256, 25/256, 25/256, 13/256, 13/256, 11/256, and 3/256.
  • Red/Blue has no day/night encounter column; tables group each area by encounter method with R/B game chips and a single merged Rate column.

Related articles

Pokemon Red and Blue Walkthrough HubPhase 7: Volcano BadgePrevious: Routes 16-18 and Cycling RoadNext: Cinnabar Island and Pokemon Mansion